Cannot connect to anyone. I ALREADY HAVE MY MICROSOFT ACCOUNT ON AND CAN EVEN FIND MY FRIENDS BUT CANT CONNECT TO THEM

Bought Minecraft yesterday because it was already crossplatform. But whenever I try to connect to someone elses world, the loading screen freezes a little and then automatically shows the message:

"its not possible to conect to this world" 

 Ive tried making the world and then invite them but its the same. There is just no way I cant connect to anyone and that really dissapoint me because I  waited all this time to finally be able to play with my pc friends and I just cant do it. Surfing the web and forums a lot of people have this issue since 10 dic 2019 and even when you have released some bugfixes this one problem still appears.